Communication system, user device thereof and synchronization method thereof

Abstract

A communication system, user device thereof, and a synchronization method thereof are provided. The communication system includes a user device and a wireless network. A ciphering configuration information is transmitted to a user device. The user device and wireless network re-establishing the radio link control (RLC) entity of logical link. The user device changes to the new ciphering configuration immediately following the re-establishment of RLC entity according to the received ciphering configuration information and the wireless network changes to the new ciphering configuration.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention generally relates to a synchronization method of communication, in particular, to a synchronization method adapted to be employed in the third generation mobile communication system for decreasing the call-dropping probability thereof.[0003]2. Description of Related Art[0004]With the arrival of the information era, demands for mobile audio, data communication, and kinds of mobile service are continuously increasing. Limited communication channels and insufficient transmission speed deter the concurrent communication system to be further developed. Therefore, the third generation mobile (3G) mobile communication, capable of providing higher frequency band utilizing efficiency and faster transmission service, has been developed accordingly.[0005]FIG. 1 is a schematic diagram for illustrating a 3G mobile communication network. Referring to FIG. 1, a user equipment (UE) 10, e.g., a cellular phone or on...

AI Technical Summary

Benefits of technology

[0011]Accordingly, the present invention is directed to a synchronization method for a communication system. The synchronization method is adapted to ensure, in a system relocation procedure, a user device and a wireless network thereof to synchronously transmit data with a same configuration, thus avoiding data encrypting / decrypting errors, reducing transmission failure, and decreasing the call-dropping probability thereof.

[0012]The present invention is directed to provide a user device. In a system relocation procedure, the user device according to the present invention can be guaranteed to be synchronized with a wireless network to transmit data in a same configuration. In such a way, data encrypting / decrypting operation can be more reliable, and the transmission arrival rate and call sustaining rate are enhanced.

[0013]The present invention is directed to provide a communication system. In a system relocation procedure, a user device and a wireless network thereof to be synchronized with each other to transmit data in a same configuration can be ensured. In such a way, data encrypting / decrypting operation can be more reliable, and the transmission arrival rate and call sustaining rate are enhanced.

[0018]According to the present invention, upon receiving the ciphering configuration information, the user device suspends transmission of the electronic information, then changes to a new configuration according to the ciphering configuration information, the wireless network changes to the new configuration, and after changing to the new configuration, the user device resumes transmission of the electronic information. Thus, reducing transmission failure and decreasing the call-dropping probability thereof.

Problems solved by technology

Limited communication channels and insufficient transmission speed deter the concurrent communication system to be further developed.

However, the 3G mobile communication standard does not clearly define when the UTRAN should use its corresponding new ciphering configuration.

Unfortunately, if the UTRAN has already used the new ciphering configuration to receive the measurement report, the UE and the UTRAN is unsynchronized, thus causing incorrectly data encrypting / decrypting of the two parties.

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